Underwater chemical injection metering valve

Abstract

This invention discloses an underwater chemical agent injection metering valve, relating to the field of marine oil and gas extraction technology. It includes an inlet pipe, a first outlet pipe, a second outlet pipe, an outlet connector, and a valve assembly. A first venturi tube is provided on the inlet pipe; a second venturi tube is provided on the second outlet pipe. The throat diameter of the first venturi tube is larger than that of the second venturi tube, and the diameter of the first outlet pipe is larger than that of the second venturi tube. A second connection port and a third connection port are respectively connected to the inlets of the first and second outlet pipes. The valve assembly is used to control whether the first connection port is connected to the second and third connection ports. The beneficial effects of this invention are: through the structural and dimensional design of the first outlet pipe, the first venturi tube, and the second venturi tube, the large-range ratio of the underwater chemical agent injection metering valve of this invention is greatly improved, enabling it to adapt to different viscosities and control flow rates.

Description

Technical Field

[0001] This invention relates to the field of marine oil and gas extraction technology, and in particular to an underwater chemical injection metering valve. Background Technology

[0002] Offshore oil and gas development is playing an increasingly important role in industrial development, people's livelihood, and energy reserves. Chemical injection is a core process to ensure the long-term safe operation of underwater production systems. It is used for hydrate inhibition, corrosion protection, etc. Only by controlling the precise injection volume can pipelines be protected without wasting chemicals and effectively controlling extraction costs.

[0003] However, in the existing technology, the mainstream injection metering valve at home and abroad uses a venturi tube as a throttling device. The drawback of this method is that it results in a limited range of product measurement and cannot meet the objective requirements of a large range ratio. Summary of the Invention

[0004] The purpose of this invention is to design an underwater chemical agent injection metering valve to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] Underwater chemical agent injection metering valve, including:

[0007] Inlet pipe; the inlet pipe is equipped with a first Venturi tube;

[0008] First outlet tube;

[0009] The second outlet pipe is equipped with a second Venturi tube. The throat diameter of the first Venturi tube is larger than that of the second Venturi tube, and the diameter of the first outlet pipe is larger than that of the second Venturi tube.

[0010] Liquid outlet connector; the outlets of both the first and second liquid outlet pipes are connected to the liquid outlet connector;

[0011] Valve assembly; the valve assembly is provided with a first connection port, a second connection port and a third connection port. The first connection port is connected to the outlet of the inlet pipe, and the second and third connection ports are connected to the inlets of the first and second outlet pipes, respectively. The valve assembly is used to control whether the first connection port is connected to the second and third connection ports.

[0012] The beneficial effects of the present invention are as follows: through the structural and dimensional design of the first outlet pipe, the first venturi pipe and the second venturi pipe, the large range ratio of the underwater chemical agent injection metering valve of the present invention is greatly improved, which can achieve the purpose of adapting to different viscosities and controlling the flow rate. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the underwater chemical agent injection metering valve of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of the second outlet pipe in the underwater chemical agent injection metering valve of the present invention;

[0015] Figure 3 This is a schematic diagram of the structure of the first outlet pipe in the underwater chemical agent injection metering valve of the present invention;

[0016] Figure 4 This is a schematic diagram of the valve assembly in the underwater chemical agent injection metering valve of the present invention;

[0017] Figure 5 yes Figure 3 A cross-sectional schematic diagram of AA in the middle;

[0018] Figure 6 yes Figure 3 A cross-sectional schematic diagram of DD;

[0019] Figure 7 This is a schematic diagram of the core electrical connector in the underwater chemical agent injection metering valve of the present invention;

[0020] Figure 8 This is a schematic diagram of the underwater chemical agent injection metering valve of the present invention with the primary valve fully open;

[0021] Figure 9 This is a schematic diagram of the fluid flow in the underwater chemical agent injection metering valve of the present invention, showing the first-stage valve fully open.

[0022] Figure 10 This is a schematic diagram of the underwater chemical agent injection metering valve of the present invention, showing only the two-stage valves fully open;

[0023] Figure 11 This is a schematic diagram of the fluid flow in the underwater chemical agent injection metering valve of the present invention, with only the secondary valve fully open;

[0024] Figure 12 This is a schematic diagram of the underwater chemical agent injection metering valve of the present invention in the closed state;

[0025] Figure 13 This is a schematic diagram of the underwater chemical agent injection metering valve of the present invention in the closed state;

[0026] Figure 14 This is a schematic diagram of the inlet pipe in the underwater chemical agent injection metering valve of the present invention;

[0027] Figure 15 This is a schematic diagram of the structure of the second outlet pipe in the underwater chemical agent injection metering valve of the present invention;

[0028] Figure 16This is a schematic diagram of the dual differential pressure venturi tube structure of the present invention;

[0029] Figure 17 This is a schematic diagram of the structure of the multivariable transmitter in the underwater chemical agent injection metering valve of the present invention;

[0030] Figure 18 This is a schematic diagram of the internal structure of the multivariable transmitter in the underwater chemical agent injection metering valve of the present invention;

[0031] The corresponding figure labels are:

[0032] 1-Inlet pipe, 2-Protective body, 3-First valve core, 4-Compression spring, 5-Second valve core, 6-First venturi tube, 7-Electronic cylinder, 8-Microprocessor, 9-Electronic compartment, 10-Limit module, 11-D-type handle, 12-Core electrical connector, 13-Outlet connector, 14-Guide block, 15-Multi-parameter transmitter; 16-First outlet pipe, 17-Second outlet pipe, 18-Second venturi tube, 19-Valve stem, 20-Connecting rod, 21-Metal diaphragm, 22-Pressure sensing port, 23-YP-C2 pressure sensing assembly. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0038] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0040] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the underwater chemical agent injection metering valve includes:

[0041] Inlet pipe 1; A first Venturi tube 6 is provided on inlet pipe 1;

[0042] First outlet pipe 16;

[0043] Second outlet pipe 17; a second venturi tube 18 is provided on the second outlet pipe 17, the throat diameter of the first venturi tube 6 is larger than the throat diameter of the second venturi tube 18, and the diameter of the first outlet pipe 16 is larger than the throat diameter of the second venturi tube 18.

[0044] The outlet of the first outlet pipe 16 and the outlet of the second outlet pipe 17 are both connected to the outlet connector 13.

[0045] Valve assembly; the valve assembly is provided with a first connection port, a second connection port and a third connection port. The first connection port is connected to the outlet of the liquid inlet pipe 1, and the second connection port and the third connection port are connected to the inlets of the first liquid outlet pipe 16 and the second liquid outlet pipe 17, respectively. The valve assembly is used to control whether the first connection port is connected to the second connection port and the third connection port.

[0046] The valve assembly includes a drive element, a valve stem 19, a first valve core 3, and a second valve core 5. Both the first valve core 3 and the second valve core 5 are mounted on the valve stem 19. The drive element drives the valve stem 19 to control the connection between the first connection port and the second and third connection ports. The driving end of the drive element acts on the valve stem 19. When the first connection port is connected to the second connection port, the first valve core 3 is separated from the second connection port. When the first connection port is connected to the third connection port or the connection between the first and second connection ports is cut off, the first valve core 3 is pressed against the second connection port, and the second valve core 5 is separated from the third connection port. When the first connection port is connected to the third connection port or the first connection port is connected to the second connection port, the first valve core 3 is separated from the second connection port, and the second valve core 5 is separated from the third connection port. When the first connection port is cut off from the second connection port, the first valve core 3 is pressed against the second connection port. When the first connection port is cut off from the third connection port, the second valve core 5 is pressed against the third connection port.

[0047] The valve assembly also includes a connector. The second valve core 5 is fixedly installed at the first end of the valve stem 19. The driving end of the drive member acts on the second end of the valve stem 19. The first valve core 3 is installed at the first end of the valve stem 19 through the connector. When the first connection port is connected to the second connection port, the first valve core 3 is separated from the second connection port, and the second valve core 5 is separated from the third connection port.

[0048] The connector includes a connecting rod 20, a limiting member, and an elastic member. The first end of the valve stem 19 is provided with a connecting blind hole. The first end of the connecting rod 20 is movably installed in the connecting blind hole. The second end of the connecting rod 20 is fixedly connected to the first valve core 3. The limiting member is used to restrict the first end of the connecting rod 20 from disengaging from the connecting blind hole. The two elastic ends of the elastic member act on the first end of the valve stem 19 and the first valve core 3, respectively. When the first connection port and the second connection port are disconnected, the elastic force of the elastic member on the first valve core 3 is greater than zero, and the direction of the elastic force is from the first end of the connecting rod 20 toward the second end of the connecting rod 20.

[0049] The elastic element is a compression spring 4, which is fitted onto the connecting rod 20. The two ends of the compression spring 4 are in contact with the first end of the valve stem 19 and the first valve core 3, respectively. The limiting element is fixedly installed by the two ends of the compression spring 4 to the first end of the valve stem 19 and the first valve core 3, respectively. When the energy stored in the compression spring 4 is zero, the first end of the connecting rod 20 is located in the connecting blind hole.

[0050] The limiting component includes a limiting ring and a limiting block. The limiting block is fixedly installed at the first end of the connecting rod 20, and the limiting ring is fixedly installed at the opening of the connecting blind hole. The diameter of the limiting ring is smaller than the size of the limiting block. The limiting ring is used to restrict the limiting block from moving from inside the connecting blind hole through the limiting ring to outside the connecting blind hole. The structure of the limiting component is not shown in the figure.

[0051] The driving component is a linear motion component, and the moving end of the linear motion component acts on the second end of the valve stem 19. The linear motion component is an electric cylinder 7.

[0052] The underwater chemical agent injection metering valve also includes a protective body 2, a core electrical connector 12, an electronic compartment 9, and a microprocessor 8. The microprocessor 8 is installed inside the electronic compartment 9. The inlet pipe 1, the first outlet pipe 16, the second outlet pipe 17, and the valve assembly are located inside the protective body 2. When the core electrical connector 12 is connected to the core electrical connector 12 of the external connection device, the core electrical connector 12 provides power to the drive unit and the microprocessor 8 and communicates with the platform. The control signal output terminal of the microprocessor 8 is connected to the control signal input terminal of the drive unit.

[0053] like Figure 17 and Figure 18 As shown, the underwater chemical agent injection metering valve also includes two multi-parameter transmitters 15. The two multi-parameter transmitters are used to measure the data information of the fluid passing through the first Venturi tube 6 and the second Venturi tube 18, respectively. The data information includes differential pressure and pressure. The data signal output terminal of the multi-parameter transmitter 15 is connected to the data signal input terminal of the microcontroller. The multi-parameter transmitter 15 includes three pressure-sensing ports 22, a metal diaphragm 21, three metal diaphragms, and a YP-C2 pressure-sensing component 23. The three metal diaphragms are respectively set at the three pressure-sensing ports 22. The three pressure-sensing terminals of the YP-C2 pressure-sensing component 23 are respectively used to collect the pressure of the three pressure-sensing ports 22. The three pressure-sensing ports 22 are respectively set at both ends of the throat of the first Venturi tube 6 or the inlet end of the second Venturi tube 18. The signal output terminal of the YP-C2 pressure-sensing component 23 is connected to the signal input terminal of the electronic component 21. Multivariable transmitters can measure differential pressure between three points: flow rate differential pressure and viscosity differential pressure. They can be better housed in a compact structure, reducing overall size and weight, and facilitating underwater installation.

[0054] The underwater chemical injection metering valve also includes a D-type handle 11 and a guide block 14. The guide block 14 is fixedly installed on the outside of the first end of the protective body 2, and the D-type handle 11 is fixedly installed on the protective body 2. The guide block 14 is used for installation guidance when the underwater chemical injection metering valve is connected to external connection equipment.

[0055] The working principle of the underwater chemical agent injection metering valve of this invention is as follows:

[0056] During installation, the underwater robot holds the underwater chemical injection metering valve using the D-shaped handle 11. Upon reaching the installation position, guided by the guide block 14 (which has a guide groove), and aligned with the guide block 14, a force is applied to the underwater chemical injection metering valve, inserting it into the external connection device. When the core electrical connector 12 connects to the external connection device, it provides power to the drive unit and microprocessor 8, and communicates with the platform. The inlet pipe 1 connects to the external connection device. The outlet is connected, and the outlet connector 13 is connected to the interface of the external connection equipment that requires liquid inlet. A limit module 10 is provided on the protective body 2. The limit module 10 includes a limit post and a compression spring. The protective body 2 has a mounting hole. The first end of the limit post is movably installed in the mounting hole. The two ends of the compression spring respectively press against the first end of the limit post and the mounting hole. The size of the first end of the limit post is larger than the size of the opening of the mounting hole. A limit hole is provided at the corresponding position of the external connection equipment. When the underwater chemical injection metering valve is installed, the first end of the limit post is located in the limit hole. The structure of the limit module 10 is not shown in the figure.

[0057] When the valve is closed, the first valve core 3 is in contact with the second connection port, and the second valve core 5 is in contact with the third connection port. The energy stored in the compression spring 4 of the connecting piece is greater than zero. Figure 12 and Figure 13 ;

[0058] When the valve is opened to connect the first and third connection ports, the electric cylinder 7 starts, driving the valve stem 19 and the second valve core 5 to move a preset distance in the first direction. Then, the electric cylinder 7 stops, separating the second valve core 5 from the third connection port, thus opening the connection between the inlet pipe 1 and the outlet pipe 17. Simultaneously, the pressure at the first venturi tube 6 and the second venturi tube 18 is collected by two multi-parameter transmitters 15, achieving metering under low flow conditions. In this situation, although the compression spring 4 releases some energy, it still supports the first valve core 3. Under the action of the compression spring 4, the first valve core 3 remains in contact with the second connection port. The first direction is the direction from the first end of the valve stem 19 to the second end of the valve stem 19. Figure 10 and Figure 11 As shown;

[0059] When connecting the first and second connection ports: When connecting the first and third connection ports, the electric cylinder 7 restarts, driving the valve stem 19 and the second valve core 5 to continue moving in the first direction. After the energy of the compression spring 4 is fully released, it continues to drive the valve stem 19 and the second valve core 5 to move in the first direction. At this time, under the action of the limiting member, the connecting piece and the first valve core 3 move in the first direction together with the valve stem 19, so that the first and second connection ports are connected, realizing the purpose of opening the connection between the inlet pipe 1 and the first outlet pipe 16 and the second outlet pipe 17. The pressure at the first venturi tube 6 and the second venturi tube 18 is simultaneously collected by the two multi-parameter transmitters 15 to achieve metering under high flow conditions; in the closed state, the movement process is the same as above; Figure 8 and Figure 9 As shown.

[0060] The opening of the second valve core 5 serves as a secondary valve, while the first valve serves as a primary valve. In high-flow conditions, both the primary and secondary valves are open, with the secondary valve required to remain fully open. Flow control under high flow conditions is achieved by controlling the opening of the primary valve, and the flow is measured using the first Venturi tube 6 at the outlet of the inlet pipe 1. In low-flow conditions, the primary valve remains normally closed, and flow control under low flow conditions is achieved by controlling the opening of the secondary valve, with the flow measured using the second Venturi tube 18 at the outlet pipe 17. Furthermore, the measurement range ratio of the first Venturi tube 6 and the second Venturi tube 18 is 20, resulting in an overall range ratio of 400, which is significantly wider than that of conventional Venturi tubes.

[0061] Flow measurement of chemical reagents with different viscosity coefficients, such as Figure 14 , Figure 15 and Figure 16 As shown;

[0062] According to the pressure P of the first Venturi tube 6 11 P at the inlet throat 12 P 13 The differential pressure between the two and the P of the second Venturi tube 18 21 P 22 P 23 The differential pressure between them can be used to measure the flow rate of different agents with different viscosities online, achieving accurate metering;

[0063] Online Viscosity Measurement and Discharge Coefficient Correction under Dual Differential Pressure: The theoretical basis of online viscosity measurement technology combines the dual differential pressure Venturi tube structure with Darcy's formula (Formula 1) in fluid mechanics. A specially designed dual differential pressure Venturi tube structure is shown below. Figure 16 As shown, the fluid flows vertically from bottom to top. One pressure tap is set at the inlet section, and two pressure taps are set at the throat. The throttling differential pressure ΔP = P1 - P2; the throat differential pressure ΔP 23= P2- P3, l i (i=1, 12, 2, 23) represents the lengths of each segment in the diagram.

[0064] Under laminar flow conditions, the friction coefficient λ depends only on the Reynolds number Re. The Darcy formula is used to calculate the frictional pressure loss ΔP along the flow path. f , is represented as: ;

[0065] The friction coefficient λ and Reynolds number Re are calculated as follows: ;

[0066] The differential pressure ΔP in the throat 23 and pipe section length l 23 Substitute the frictional resistance voltage loss ΔP f By combining the friction coefficient λ and the Reynolds number Re, the viscosity μ of the medium can be obtained, expressed as: ;

[0067] The throttling differential pressure ΔP consists of four parts: frictional pressure loss ΔP f , resistance voltage loss ΔP l Gravitational pressure drop ΔP g and velocity pressure drop ΔP a By combining the equations and substituting the medium viscosity μ, the mass flow rate Q inside the pipe can be obtained. m ,

[0068] The throttling differential pressure ΔP is expressed as: ;

[0069] For a Venturi tube with a cone angle of θ in the contraction section, the frictional pressure loss is expressed by integration as: ;

[0070] The form resistance voltage drop is expressed as: ;

[0071] The velocity pressure drop is expressed as: ;

[0072] Combining the above equations, we can obtain the mass flow rate:

[0073] ;

[0074] Through mass flow Q m The Reynolds number and medium viscosity can be obtained from the throat differential pressure; when the single-phase medium is in laminar flow (Re<2000), the correction factor K is a constant. The correction factor K value is obtained by standard loop calibration before the equipment leaves the factory.

[0075] After obtaining the fluid viscosity, the fluid Reynolds number is obtained using the Reynolds number calculation formula, expressed as: ;

[0076] Then, obtain the corresponding outflow coefficient using the following empirical formula:

[0077]

[0078] l i Where i is the pipe section length, i = 1, 12, 2, 23; D is the inlet diameter; d is the throat diameter; β is the throat diameter ratio; θ is the cone angle of the contraction section; λ is the friction coefficient; μ is the viscosity of the medium; ρ is the density of the medium; u is the flow velocity of the medium; and A is the cross-sectional area of ​​the throat.

[0079] The technical solutions of the present invention are not limited to the specific embodiments described above. Any technical modifications made in accordance with the technical solutions of the present invention fall within the protection scope of the present invention.

Claims

1. An underwater chemical agent injection metering valve, characterized in that, include: Inlet pipe; A first Venturi tube is installed on the inlet pipe; First outlet tube; Second outlet pipe; The second outlet tube is equipped with a second Venturi tube. The throat diameter of the first Venturi tube is larger than that of the second Venturi tube, and the diameter of the first outlet tube is larger than that of the second Venturi tube. Liquid outlet connector; the outlets of both the first and second liquid outlet pipes are connected to the liquid outlet connector; Valve assembly; the valve assembly is provided with a first connection port, a second connection port and a third connection port. The first connection port is connected to the outlet of the inlet pipe, and the second and third connection ports are connected to the inlets of the first and second outlet pipes, respectively. The valve assembly is used to control whether the first connection port is connected to the second and third connection ports.

2. The underwater chemical agent injection metering valve according to claim 1, characterized in that, The valve assembly includes a drive element, a valve stem, a first valve core, and a second valve core. Both the first and second valve cores are mounted on the valve stem. The drive element drives the valve stem to control the connection between the first connection port and the second and third connection ports. The driving end of the drive element acts on the valve stem. When the first connection port is connected to the second connection port, the first valve core is separated from the second connection port. When the first connection port is connected to the third connection port or the connection between the first and second connection ports is cut off, the first valve core is pressed against the second connection port, and the second valve core is separated from the third connection port. When the first connection port is connected to the third connection port or the first connection port is connected to the second connection port, the first valve core is separated from the second connection port, and the second valve core is separated from the third connection port. When the connection between the first and second connection ports is cut off, the first valve core is pressed against the second connection port. When the connection between the first and third connection ports is cut off, the second valve core is pressed against the third connection port.

3. The underwater chemical agent injection metering valve according to claim 2, characterized in that, The valve assembly also includes a connector. The second valve core is fixedly installed at the first end of the valve stem. The driving end of the drive member acts on the second end of the valve stem. The first valve core is installed at the first end of the valve stem through the connector. When the first connection port is connected to the second connection port, the first valve core is separated from the second connection port, and the second valve core is separated from the third connection port.

4. The underwater chemical agent injection metering valve according to claim 3, characterized in that, The connector includes a connecting rod, a limiting member, and an elastic member. The first end of the valve stem is provided with a connecting blind hole. The first end of the connecting rod is movably installed in the connecting blind hole. The second end of the connecting rod is fixedly connected to the first valve core. The limiting member is used to prevent the first end of the connecting rod from disengaging from the connecting blind hole. The two elastic ends of the elastic member act on the first end of the valve stem and the first valve core, respectively. When the first connection port and the second connection port are disconnected, the elastic force of the elastic member on the first valve core is greater than zero, and the direction of the elastic force is from the first end of the connecting rod toward the second end of the connecting rod.

5. The underwater chemical agent injection metering valve according to claim 4, characterized in that, The elastic element is a compression spring, which is fitted onto the connecting rod. The two ends of the compression spring are in contact with the first end of the valve rod and the first valve core, respectively. The limiting element is fixedly installed by the two ends of the compression spring to the first end of the valve rod and the first valve core, respectively. When the energy stored in the compression spring is zero, the first end of the connecting rod is located in the connecting blind hole.

6. The underwater chemical agent injection metering valve according to claim 4, characterized in that, The limiting component includes a limiting ring and a limiting block. The limiting block is fixedly installed at the first end of the connecting rod, and the limiting ring is fixedly installed at the opening of the connecting blind hole. The diameter of the limiting ring is smaller than the size of the limiting block. The limiting ring is used to restrict the limiting block from moving from inside the connecting blind hole through the limiting ring to outside the connecting blind hole.

7. The underwater chemical agent injection metering valve according to claim 2, characterized in that, The driving component is a linear moving component, and the moving end of the linear moving component acts on the second end of the valve stem.

8. The underwater chemical agent injection metering valve according to claim 2, characterized in that, The underwater chemical agent injection metering valve also includes a protection body, a core electrical connector, an electronic compartment, and a microprocessor. The microprocessor is installed in the electronic compartment. The inlet pipe, the first outlet pipe, the second outlet pipe, and the valve assembly are located inside the protection body. When the core electrical connector is connected to the core electrical connector of an external connection device, the core electrical connector provides power to the drive unit and the microprocessor and communicates with the platform. The control signal output terminal of the microprocessor is connected to the control signal input terminal of the drive unit.

9. The underwater chemical agent injection metering valve according to claim 8, characterized in that, The underwater chemical agent injection metering valve also includes two multi-parameter transmitters. These two multi-parameter transmitters are used to measure the data information of the fluid passing through the first and second venturi tubes, respectively. The data information includes differential pressure and pressure. The data signal output terminal of the multi-parameter transmitter is connected to the data signal input terminal of the microcontroller. The multi-parameter transmitter includes three pressure-sensing ports, a metal diaphragm, three metal diaphragms, and a YP-C2 pressure-sensing component. The three metal diaphragms are respectively set at the three pressure-sensing ports. The three pressure-sensing terminals of the YP-C2 pressure-sensing component are used to collect the pressure at the three pressure-sensing ports. The three pressure-sensing ports are respectively set at both ends of the throat and the inlet end of the first or second venturi tube. The signal output terminal of the YP-C2 pressure-sensing component is connected to the signal input terminal of the electronic component.

10. The underwater chemical agent injection metering valve according to claim 8, characterized in that, The underwater chemical injection metering valve also includes a D-type handle and a guide block. The guide block is fixedly installed on the outside of the first end of the protection body, and the D-type handle is fixedly installed on the protection body. The guide block is used for installation guidance when the underwater chemical injection metering valve is connected to external connection equipment.

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